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Welcome to our google-sites page on strategies for analyzing electron scattering data from the nanoworlds of YOUR NEIGHBORHOOD in the Milky Way, as complement to the electron detectives webpage here.

The image above shows 3D ``photocopies" of some molecular-models constructed with Mathematica, and printed out with a scale size of 1 Angstrom = 2 millimeters. The top two copies are silicon cubes with faceted-truncations, plus (only on the right hand side) with facets outlined in white. At bottom left is an m=4 graphite hex-prism with white van der Waals bonds and 4 graphene-sheets, which sheets have 4 carbon atoms (paired) along each of their 6 edges. The printout at bottom-right is another silicon model, this time with a silicon {110} face at top and silicon {111} facets along the sides, while the center-model is a face-centered-cubic palladium "bow-tie", extracted from a 10 bow-tie icosahedral-twin.

The figure at right analyzes the direct-space location, and vector phase-gradients, of a selected range of periodicities (green circle) in the power-spectrum of a "zone-plate" image (top left panel), using our digital darkfield plugins for the freely-available technical image analysis program ImageJ. The complex darkfield image (lower left panel) uses logarithmic complex-color to display amplitude & phase for each pixel. Phase-gradient or periodicity-strain is broken into isotropic (top right panel) & shear (bottom right panel) components, with compression red, tension cyan, CCW-twist indigo, and CW-twist chartreuse.

The above figure is from Mathematica work on the contrast transfer function in a given experimental image, based on the transfer function zeros which show up in regions with diffuse scattering. A diagnostic projected-potential & diffraction-pattern are on the left. The model point-spread (top-center panel) & contrast-transfer (bottom-center panel) functions are shown in logarithmic complex-color. Strong phase-object microscope image & image power-spectrum are on the right.

Messages

2016-2017 updatesCheck out: the new models and papers about our JS/HTML nanoworld electron-optics simulator, the new reports and upcoming data submission site for using electrons to find lightspeed, and ...
Posted Apr 12, 2017, 3:04 PM by pb fraundorf

javascript electron opticsWe've now started a section up here about our work on real-time web-based simulators for electron-microscope data-acquisition and image-analysis. For instance, our nanostructure explorer ...
Posted Jul 7, 2014, 7:40 AM by pb fraundorf

ASCI 2014 debriefI really enjoyed the meeting during several dry spring days in Seattle. Slides for my talk may be found here on the page about Analytic approaches.
Posted Jun 1, 2014, 11:27 AM by pb fraundorf